The different elements of phloem include sieve tubes, companion cells, and phloem parenchyma and phloem fibres.
1. Sieve tubes: Transport sugars and nutrients up and down the plants in sieve cells.
2. Companion cells: Controls the activity of sieve tube.
3. Phloem parenchyma: Provides mechanical strength to the plant.
4. Phloem fibres: Stores compound such as starch.
Thus, sieve tubes and companion cells are the two components of phloem tissue that help in ransportation of food in plants.